That company’s challenge now is to invent the catalytic mechanisms that will make the dream a reality. I’ve advised its executives against investing heavily in hoopla events to fire up thousands of frontline employees about the new BHAG. Instead, they should create and implement a set of catalytic mechanisms—specific, concrete, and powerful devices to lend discipline to their vision. After all, catalytic mechanisms alone will not create greatness; they need a dream to guide them. But if you can blend huge, intangible aspirations with simple, tangible catalytic mechanisms, then you’ll have the magic combination from which sustained excellence grows.